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Dhondt, S. (author), Kraan, K.O. (author), Chen, T.M. (author), van der Meulen, F.A. (author), Islam, D. (author), van der Zee, F.A. (author)The goal of the report is to assess the current skills for different categories of railway staff, from workers to engineers, railway managers and researchers (task 1). The study on socioeconomic aspects of human capital starts with assessing the state of play regarding present employment situation considering work already done on forecasts for...report 2019
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Veraar, R.G. (author), Wieling, W.P.W. (author)Solid Fuel Ramjet (SFRJ) technology is a very attractive propulsion option to extend the range of gun launched projectiles mainly due to the combination of high specific impulse inherent to airbreathing propulsion and mechanical properties of the solid fuel capable of withstanding the very high launch loads in the gun. In 2004, the Netherlands...conference paper 2018
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Thompson, D. (author), Squicciarini, G. (author), Zhang, J. (author), Lopez Arteaga, I. (author), Zea, E. (author), Dittrich, M.G. (author), Jansen, H.W. (author), Arcas, K. (author), Cierco, E. (author), Magrans, F.X. (author), Malkoun, A. (author), Iturritxa, E. (author), Guiral, A. (author), Stangl, M. (author), Schleinzer, G. (author), Martin Lopez, B. (author), Chaufour, C. (author), Wändell, J. (author)The noise produced during a train pass-by originates from several different sources such as propulsion noise, noise from auxiliary equipment, aerodynamic noise and rolling noise. The rolling noise is radiated by the wheels and the track and is excited by the wheel and rail unevenness, usually referred to as roughness. The current TSI Noise...article 2018
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de Laat, J. (author), Weemstra, C. (author), Verdel, A. (author), Jousset, P. (author), Blanck, H. (author)Timing errors are a notorious problem in seismic data acquisition and processing. A technique is presented that allows such time shifts to be detected and corrected in a systematic fashion. The methodology relies on virtual-source responses retrieved through the application of seismic interferometry (SI). In application to recordings of ambient...conference paper 2018
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White, K. (author), Bronkhorst, A.W. (author), Meeter, M. (author)Previous studies have shown that identifiability of sound sources influence noise annoyance levels. The aim of the present experiment was to additionally study the effects of actively performing a task versus a less active pastime on noise annoyance. This was done by asking participants to perform a task (task condition) or read a magazine of...article 2018
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Ullwer, C. (author), Sprung, D. (author), van Eijk, A.M.J. (author), Gunter, W. (author), Stein, K. (author)Atmospheric turbulence impacts on the propagation of electro-optical radiation. Typical manifestations of optical turbulence are scintillation (intensity fluctuations), beam wander and (for laser systems) reduction of beam quality. For longer propagation channels, it is important to characterize the vertical and horizontal distribution ...conference paper 2018
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Ushakov, A. (author), Verlaan, A.L. (author), Ebeling, R.P. (author), Rijfers, A. (author), O'Neill, R. (author), Smith, M. (author), Stratton, B. (author), Koster, N.B. (author), van der List, J.F.M. (author), Gattuso, A. (author), Lasnier, C.J. (author), Feder, R. (author), Maniscalco, M.P. (author), Verhoeff, P. (author)In ITER, first mirrors for the Upper Wide Angle Viewing System (UWAVS) are expected to experience contamination with beryllium and tungsten. Contamination levels of 10 nm can degrade mirror performance. In the UWAVS, a first mirror cleaning system will use radio-frequency (RF) gas discharge. A mockup in representative geometry was developed. The...article 2018
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de Vet, H.C.W. (author), Mullender, M.G. (author), Eekhout, I. (author)Objective: The concept of specific agreement (SA) has been proposed for dichotomous outcomes for two or more raters. We aim to extend this concept for variables with more than two ordinal or nominal categories and more than two raters. Study Design and Setting: We used two data sets: four plastic surgeons classifying photographs after breast...article 2018
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Damodaran, M. (author), Amelink, A. (author), de Boer, J.F. (author)Retinal blood vessel oxygenation is considered to be an important marker for numerous eye diseases. Oxygenation is typically assessed by imaging the retinal vessels at different wavelengths using multispectral imaging techniques, where the choice of wavelengths will affect the achievable measurement accuracy. Here, we present a detailed analysis...article 2018
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Niks, I.M.W. (author), Gevers, J.M.P. (author), de Jonge, J. (author), Houtman, I.L.D. (author)Effective interventions to prevent work stress and to improve health, well-being, and performance of employees are of the utmost importance. This quasi-experimental intervention study presents a specific method for diagnosis of psychosocial risk factors at work and subsequent development and implementation of tailored work stress interventions,...article 2018
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Audigier, V. (author), White, I.R. (author), Jolani, S. (author), Debray, T.P.A. (author), Quartagno, M. (author), Carpenter, J. (author), van Buuren, S. (author), Resche-Rigon, M. (author)We present and compare multiple imputation methods for multilevel continuous and binary data where variables are systematically and sporadically missing. The methods are compared from a theoretical point of view and through an extensive simulation study motivated by a real dataset comprising multiple studies. The comparisons show that these...article 2018
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Salomons, E.M. (author), Bakri, T. (author)Temporal variations of traffic noise levels originate from two effects: (1) traffic variations and (2) atmospheric variations. Traffic variations include variations of traffic volume and vehicle speed, and cause variations of the emission of sound at the source. Atmospheric variations cause variations of the propagation of sound from the source...article 2018
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Binnerts, B. (author), Mulders, I. (author), Blom, K. (author), Colin, M. (author), Dol, H. (author)Autonomous Underwater Vehicles (AUVs) offer an automated solution for the collection of environmental data underwater. While they provide an effective solution in scenarios where their task is limited to basic sensor data collection, supervisory control by an operator is still needed to make more complicated decisions. Because raw data of camera...conference paper 2018
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Goede, H. (author), de Vries, Y.C. (author), Kuijpers, E. (author), Fransman, W. (author)This review describes an evaluation of the effectiveness of Risk Management Measures (RMM) for nanomaterials in the workplace. Our aim was to review the effectiveness of workplace RMM for nanomaterials and to determine whether established effectiveness values of conventional chemical substances applied for modelling purposes should be adopted or...article 2018
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Dhondt, S. (author), van der Meulen, F.A. (author), Chen, T.M. (author), Islam, D. (author)The main aim of this report is to provide an analysis of the view-points offered by 27 participants during the foresight workshop on employment and skills situation in the European railway sector. The participants, mainly experts, policy specialists and social partners, were invited to react to the conclusions of the study on changes in...report 2018
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van der Eerden, F.J.M. (author), Wessels, P.W. (author), Basten, T.G.H. (author), Botteldooren, D. (author), van Rentherghem, T. (author), de Coensel, B. (author)A long-term monitoring project, with 12 months of continuous operation time, is described where the sound sources within a large industrial area as well as the sound levels in the nearby residential area are measured. The sources in the industrial area may give rise to complaints from the neighboring residential areas, at several kilometers...conference paper 2017
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Botteldooren, D. (author), van Renterghem, T. (author), van der Eerden, F.J.M. (author), Wessels, P.W. (author), Basten, T.G.H. (author), de Coensel, B. (author)Source localization using microphone arrays has now become common practice for many applications. Their application for long term monitoring of industrial noise nevertheless remains uncommon. Hence, in 2016 we deployed four microphone arrays near a large industrial area for a period of 12 months and explored the challenges involved. The...conference paper 2017
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Laan, C.M. (author), Barros, A.I. (author), Boucherie, R.J. (author), Monsuur, H. (author)This paper considers a special case of security games dealing with the protection of a large area divided in multiple cells for a given planning period. An intruder decides on which cell to attack and an agent selects a patrol route visiting multiple cells from a finite set of patrol routes such that some given operational conditions on the...conference paper 2017
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Peelen, W.H.A. (author), Vervuurt, A.H.J.M. (author)Modular expansion joints constitute a substantial part of direct and indirect costs of bridge maintenance. Joint condition assessments can be improved to predict or detect damages earlier. In this way the probability for consequential damages such as emergency repair and a shortened lifespan is reduced. Maintenance can be planned well in advance...conference paper 2017
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van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)Current high contrast imaging systems are limited at small angular separations, preventing the direct imaging of Earth-size exoplanets close to their host stars. One primary cause of this is the performance of the extreme adaptive optics (AO) system which is dominated by the servo-lag error at small angular separations. Prediction can be used to...conference paper 2017